Can you ever have too many mugs?
No.
Is it possible that the coaster also serves as a lid to help keep the coffee hot?
Those are ceramic coasters so I don’t think you could use them as lids.
I don’t see why you wouldn’t be able to use the coasters as lids, good thinkin! Set it on top & keep it warm. As long as you’re not trying to make a travel mug out of it lol
Does anyone know if these mugs will hold a large cup of keurig coffee… With room for milk?